Article
Plant Sciences
Artai A. Santos, Sreepat Jain, Jose B. Diez
Summary: Late Jurassic paleobotanical records from the northeast of Gondwana are rare, but the first palynological assemblage from the upper part of the Antalo Limestone Formation in central western Ethiopia is diverse and well-preserved, indicating an age between Late Kimmeridgian and Late Tithonian. The palynological association is dominated by pollen and spores of continental origin, with some marine influence observed, suggesting the presence of three types of continental plant communities.
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Jun Li, Cheng-Min Huang, Guo-Lin Yang, Yuan-Yuan Pan, Xing-Yue Wen
Summary: This research reveals the climate changes during the Middle Jurassic period, which included oscillations between semiarid-subhumid, arid-humid, and cool/warm-temperate climates on land. The fluctuations in climate were possibly linked to global geological events and regional tectonic uplift. The findings also suggest relatively low CO2 levels during this period, coinciding with the threshold for glacial initiation and explaining cool intervals in a warm Jurassic era.
JOURNAL OF PALAEOGEOGRAPHY-ENGLISH
(2022)
Article
Geology
Sreepat Jain, Mahider Mulugeta, Mohamed Benzaggagh, Mariusz A. Salamon, Roland Schmerold
Summary: The deposition of Mesozoic carbonates in the Horn of Africa is significant for correlation purposes. Based on the discovery of calcareous nannofossils and calpionellids, the presence of Cretaceous deposits in the Blue Nile Basin is confirmed, extending the age of the Antalo Limestone Formation to the late Berriasian. This discovery not only impacts the biostratigraphy of Ethiopia but also integrates the study region of eastern Africa with the South Tethysian margin calpionellid domain for the first time.
CRETACEOUS RESEARCH
(2022)
Article
Engineering, Civil
Daniel Mengistu, Woldeamlak Bewket, Alessandro Dosio, Hans-Juergen Panitz
Summary: This study used regional climate model (RCM), COSMO Climate Limited-area Model (CCLM), coupled with a hydrological model, Soil and Water Assessment Tool (SWAT), to assess the impact of climate change on water resources in the Upper Blue Nile River Basin. The results show that future climate change is projected to increase potential evapotranspiration and surface runoff, while decreasing total water yield of the Basin. Additionally, the contribution of baseflow to total water yield is expected to decline, which will have significant implications for water management in the Basin.
JOURNAL OF HYDROLOGY
(2021)
Article
Geology
Sreepat Jain, Roland Schmerold
Summary: This study provides updated Callovian-Kimmeridgian stratigraphic and biostratigraphic data for Ethiopia, which has significant implications for the Jurassic sedimentary evolution in the Horn of Africa and North African region. The reassessment of Antalo Limestone Fm age was based on ammonite records from three basins - Ogaden, Blue Nile, and Mekele, spanning from late Callovian to early Kimmeridgian. However, upper age assignments should be considered tentative due to the need for taxonomic re-evaluation of the ammonite fauna.
ANNALES SOCIETATIS GEOLOGORUM POLONIAE
(2021)
Article
Environmental Sciences
Mesenbet Yibeltal, Atsushi Tsunekawa, Nigussie Haregeweyn, Enyew Adgo, Derege Tsegaye Meshesha, Assefa D. Zegeye, Tesfa Gebrie Andualem, Se Jin Oh, Jong Cheol Lee, Min Woo Kang, Sang Soo Lee
Summary: Soil erosion is a global problem that poses a threat to the environment and the future of economic and social development. This study aims to investigate the impact of steep slopes and gullies on erosion in high precipitation tropical areas of the Ethiopian highlands. Monitoring of discharge and sediment concentration was carried out using a trapezoidal weir at the head and tail of the gully from 2017 to 2020. The study findings provided insights into runoff patterns, sediment dynamics, and practical recommendations for managing gully erosion in the future.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Meteorology & Atmospheric Sciences
Jemal Ali Mohammed, Temesgen Gashaw, Gebrekidan Worku Tefera, Yihun T. Dile, Abeyou W. Worqlul, Solomon Addisu
Summary: This study analyzed rainfall and temperature extremes in the Upper Blue Nile Basin of Ethiopia. The results showed a positive trend in annual, dry, and small rain seasons rainfall, and a decreasing trend in the main rain season rainfall. Several extreme rainfall indices showed insignificant positive trends. The study also noted a warming trend in the annual and seasonal maximum and minimum temperature extreme indices.
WEATHER AND CLIMATE EXTREMES
(2022)
Article
Multidisciplinary Sciences
Mariusz A. Salamon, Anna Feldman-Olszewska, Sreepat Jain, Bruno B. M. Ferre, Karolina Paszcza, Bartosz J. Plachno
Summary: Crinoids are considered good indicators for determining environmental conditions, with their distribution being strongly substrate-dependent but showing weak significance for palaeodepth. The qualitative data and statistical analysis based on crinoid occurrences in Poland suggest that different crinoid groups prefer different substrate types and depths, with some exceptions of cosmopolitan taxa.
Article
Water Resources
Asnake Enawgaw Amognehegn, Asmare Belay Nigussie, Dessalegn Worku Ayalew, Fikru F. Abera, Mihret Ayana
Summary: Climate change has various impacts on ecosystems, agriculture, human health, forestry, and water resources. This study focuses on assessing the effect of climate change on the water resources of the Kessie Watershed in Ethiopia. Using updated CMIP-6 data and multiple climate models, the study predicts an overall increase in rainfall and temperature, which will lead to an increase in streamflow. The findings suggest that the future water resource potential of the study area is sufficient for irrigation and other projects.
APPLIED WATER SCIENCE
(2023)
Article
Environmental Sciences
Melsew A. Wubneh, Tadege A. Worku, Fitamlak T. Fikadie, Tadele F. Aman, Mekash Shiferaw Kifelew
Summary: Fluctuations in temperature and precipitation trends influence the components of the hydrological cycle and water supply availability, with lake evaporation and rainfall projected to increase in the future scenarios. The study used simulated climate data and regional climate models to predict future water balance, showing a decrease in lake storage capacity across all time horizons.
GEOCARTO INTERNATIONAL
(2022)
Article
Water Resources
Timketa Adula Duguma
Summary: This study aimed to assess and classify the groundwater potential zones of Guder watershed in the Upper Blue Nile River Basin using remote sensing and GIS techniques. The study found that approximately 33.58% of the Guder River basin falls into the good and very good groundwater potential zones, while values of 23.3%, 20.2%, and 22.9% were represented by very poor, poor, and moderate groundwater potential zones respectively.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2023)
Article
Agronomy
Desale Kidane Asmamaw, Pieter Janssens, Mekete Dessie, Seifu A. Tilahun, Enyew Adgo, Jan Nyssen, Kristine Walraevens, Derbew Fentie, Wim M. Cornelis
Summary: Although farmers have a good understanding of soil acidity and its management strategies, their awareness of irrigation water management is low, leading to low yields and inefficient water use.
Article
Water Resources
Alemsha Bogale
Summary: The study utilized GIS and remote sensing to analyze the morphometric characteristics of Gilgel Abay watershed, revealing it to be a fifth-order basin with 662 drainage networks. The stream length decreases with increasing stream order, and the high bifurcation ratio indicates mountainous terrain and susceptibility to flooding. The low drainage density suggests high permeability and dense vegetation cover.
APPLIED WATER SCIENCE
(2021)
Article
Agronomy
Mulatie Mekonnen, Tigist Worku, Birru Yitaferu, Artemi Cerda, Saskia Keesstra
Summary: This study investigated the productivity and economic benefit of the Acacia decurrens based small-scale agroforestry (SSA) land use system. The results showed that the mixed land use system provided better income for small-holder farmers, motivating them to switch from sole crop or fodder land use systems. Therefore, it is recommended to promote the use of mixed land use systems in similar agro-ecological contexts.
AGROFORESTRY SYSTEMS
(2023)
Article
Water Resources
Dires Tewabe, Mekete Dessie, Desale Kidane Asmamaw, Enyew Tamiru, Enyew Adgo, Jan Nyssen, Kristine Walraevens, Wim M. Cornelis
Summary: This study in the Upper Blue Nile Basin in Ethiopia focused on the influence of irrigation activities on the groundwater system, showing that irrigation led to water table rises in irrigated fields, but had no significant impact on groundwater quality in both irrigated and non-irrigated areas. Good irrigation water management and monitoring of groundwater table are essential for the sustainability of the Koga Irrigation Scheme.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2021)
